ASoC: SOF: Intel: pci-tng: revert invalid bar size setting

[ Upstream commit ca09e2a351fbc7836ba9418304ff0c3e72addfe0 ]

The logic for the ioremap is to find the resource index 3 (IRAM) and
infer the BAR address by subtracting the IRAM offset. The BAR size
defined in hardware specifications is 2MB.

The commit 5947b2726beb6 ("ASoC: SOF: Intel: Check the bar size before
remapping") tried to find the BAR size by querying the resource length
instead of a pre-canned value, but by requesting the size for index 3
it only gets the size of the IRAM. That's obviously wrong and prevents
the probe from proceeding.

This commit attempted to fix an issue in a fuzzing/simulated
environment but created another on actual devices, so the best course
of action is to revert that change.

Reported-by: Ferry Toth <fntoth@gmail.com>
Tested-by: Ferry Toth <fntoth@gmail.com> (Intel Edison-Arduino)
Link: https://github.com/thesofproject/linux/issues/3901
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230307095341.3222-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/sof/intel/pci-tng.c b/sound/soc/sof/intel/pci-tng.c
index f0f6d9ba8803722f2fac9d63a8f619110ca284c8..0b17d1bb225e2f01b5ab22515ddff0bf834ab22d 100644 (file)
--- a/sound/soc/sof/intel/pci-tng.c
+++ b/sound/soc/sof/intel/pci-tng.c
@@ -75,11 +75,7 @@ static int tangier_pci_probe(struct snd_sof_dev *sdev)
 
        /* LPE base */
        base = pci_resource_start(pci, desc->resindex_lpe_base) - IRAM_OFFSET;
-       size = pci_resource_len(pci, desc->resindex_lpe_base);
-       if (size < PCI_BAR_SIZE) {
-               dev_err(sdev->dev, "error: I/O region is too small.\n");
-               return -ENODEV;
-       }
+       size = PCI_BAR_SIZE;
 
        dev_dbg(sdev->dev, "LPE PHY base at 0x%x size 0x%x", base, size);
        sdev->bar[DSP_BAR] = devm_ioremap(sdev->dev, base, size);